Sulfite Detection in Food Liquids (Beverages) with a Microdisk Array Sensor

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The use of a microdisk array sensor for amperometric determination of free and total sulfite in beverages was evaluated. Model solutions resulted in good sensitivity (~1 ppm) and linearity (0-120 ppm) for free SO2. In must, wine or vinegars a non-negligible residual current was observed but a good correlation between sensor response and added sulfite was obtained. Preliminary results indicate that the direct measurement of bound sulfite without alkaline hydrolysis should be possible.

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